CVE Details

Release Date:2023-02-07


The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the \name\ (e.g. \CERTIFICATE\), any header data and the payload data. If the function succeeds then the \name_out\, \header\ and \data\ arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.

See more information about CVE-2022-4450 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score: 7.5 Base Metrics: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Access Vector: Network Attack Complexity: Low
Privileges Required: None User Interaction: None
Scope: Unchanged Confidentiality Impact: None
Integrity Impact: None Availability Impact: High

Errata information

PlatformErrataRelease Date
Oracle Linux version 7 (edk2)ELSA-2023-130262023-12-06
Oracle Linux version 7 (edk2)ELSA-2023-130272023-12-07
Oracle Linux version 8 (edk2)ELSA-2023-130252023-12-06
Oracle Linux version 8 (edk2)ELSA-2023-29322023-05-24
Oracle Linux version 8 (edk2)ELSA-2023-327912023-12-06
Oracle Linux version 8 (openssl)ELSA-2023-122132023-03-28
Oracle Linux version 8 (openssl)ELSA-2023-14052023-03-22
Oracle Linux version 9 (edk2)ELSA-2023-130242023-12-06
Oracle Linux version 9 (edk2)ELSA-2023-21652023-05-15
Oracle Linux version 9 (edk2)ELSA-2023-327902023-12-07
Oracle Linux version 9 (openssl)ELSA-2023-09462023-02-28
Oracle Linux version 9 (openssl)ELSA-2023-121522023-03-01

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team